You need to calibrate the system.
If the HVAC control module is replaced, the Calibration Diagnostic and
Cooldown tests will need to be performed. Once this group of tests have
successfully passed, they can be performed individually. The engine must be
running during the test to provide hot coolant for the heater, A/C
compressor operation and to assure that the actuators are calibrated
correctly. The HVAC control module is capable of troubleshooting the system
in approximately 120 seconds. If a condition is detected, an error code is
displayed. The error code cannot be erased until the condition is repaired
and the diagnostic test is performed. Check wire before replacing
components, Refer to Wiring Diagrams.

Mode, Blend and Zone (if equipped) door calibration compensates for
mechanical variations in the actuators, HVAC control module and its
linkages. In-vehicle calibration can be entered from the control's front
panel. If the REAR WIPE and INTERMITTENT LED's flash simultaneously when
Ignition is cycled ON, the actuators have not been calibrated or during the
previous calibration a failure occurred

CALIBRATION/COOLDOWN LED DISPLAY CODES
See table for definition of flashing LED's. If no problems are found, the
control functions normally.

CALIBRATION/COOLDOWN LED DISPLAY CODES
     LED'S PASS/FAIL CORRECTIVE ACTION
     NO LED'S FLASHING-NORMAL OPERATION PASSED CALIBRATION, DIAGNOSTICS AND
COOLDOWN NONE
     REAR WIPER AND INTERMITTENT LED'S FLASH SIMULTANEOUSLY FAILED
CALIBRATION DIAGNOSTICS RUN CALIBRATION TEST
     A/C AND RECIRC LED'S FLASH SIMULTANEOUSLY FAILED COOLDOWN  RUN
COOLDOWN TEST
     REAR WIPER AND INTERMITTENT LED'S ARE FLASHING SIMULTANEOUSLY A/C AND
RECIRC LED'S ARE FLASHING SIMULTANEOUSLY FAILED CALIBRATION, DIAGNOSTICS AND
FAILED COOLDOWN TEST  RUN CALIBRATION TEST

CALIBRATION/DIAGNOSTICS TEST ENTRY
TO INITIATE TESTS:
 a.. Set Blower motor ON HIGH
 b.. Set Mode position to Panel
 c.. Open all A/C outlets
 d.. Set Temperature to Cold (Both slide pots if equipped)
 e.. Depress WASH and REAR WIPER button simultaneously for 5 Seconds (Until
all LED's light)
RESULTS:
 a.. All LED's will turn on for 5 Seconds
 b.. Calibration Test is running when REAR WIPER and INTERMITTENT are
alternately flashing. Cooldown test is running if A/C and RECIRC are
alternately flashing.
 c.. Acceptable results is REAR WIPER LED is the only LED flashing. Push
Rear Wiper to exit.
 d.. After all tests have passed, Calibration Diagnostics and Cooldown can
be run separately.
COOLDOWN TEST ENTRY
TO INITIATE TESTS:
 a.. Set Blower motor ON HIGH
 b.. Set Mode position to Panel
 c.. Open all A/C outlets
 d.. Set Temperature to Cold (Both slide pots if equipped)
 e.. Depress WASH and A/C simultaneously for 5 Seconds
NOTE: Prior to start of test, If the evaporator is already cold, the system
will fail test. To correct, operate system with A/C OFF and the blower motor
ON high for three minutes prior to starting test.

RESULTS:
 a.. All LED's will turn on for 5 Seconds
 b.. Cooldown Test is running when A/C and RECIRC. are alternately
flashing. If A/C and RECIRC. are flashing simultaneously, Cooldown has
failed.
CALIBRATION DIAGNOSTICS AND COOLDOWN ABORT
Test can be aborted by doing one of the following:

 a.. Depressing Rear Window Defogger, RECIRC and Rear Wiper buttons.
 b.. Cycling Ignition OFF and then ON.
 c.. Control will automatically abort after 15 minutes from the time
Calibration Diagnostics and Cooldown was entered.
The HVAC control module will return to normal operation or may indicate
unsuccessful Calibration Diagnostics or Cooldown test by LED's flashing
simultaneously.